GENUS ANOPLOPHRYA. 565 



and is still more suggestive of the strobiloid mode of reproduction presented by 

 Ticnia and other Cestoidea. The Rhabdocoelous Turbellarian genus Catenula, 

 again, so called from the chain-like aggregate of imperfectly separated zooids 

 distinctive of its normal growth-form, may be cited as yielding yet another 

 appropriate simile. To the advocates of the lower Annelidan affinities of the 

 Opalhice, this interesting species would seem to offer special inducements for further 

 investigation. 



Anoplophrya mytili, Quenn. sp. Pl. XXVI. Figs. 26 and 27. 



Body ovate, rounded at both extremities, slightly narrower posteriorly ; 

 about one and a half times as long as broad ; flattened and meniscoidal in 

 lateral view ; contractile vesicle single, posteriorly located ; endoplast 

 elongate-ovate, subcentral ; entire cuticular surface covered with long, fine, 

 tufted cilia. Length 1-400". 



Hab, — Marine, occurring as a parasite of the common mussel. 



Figured and described by A. Quennerstedt * under the title of Opalma mytili. 



Anoplophrya inermis, Stein. 



Size and contour agreeing with that of Hoplitophrya secans, but without 

 the ventral horny band. Hab. — Intestine of Clepsine binoculata. 



Anoplophrya striata, Duj. sp. 



Body elongate-ovate or elliptical, rounded at each extremity, about twice 

 as long as broad ; endoplast band-like, extending axially through nearly 

 the whole length of the body ; contractile vesicles numerous, disposed in 

 somewhat uneven lines on each side of the axial endoplast. Length 1-170". 



Hab. — Intestinal cavity of the common earth-worm. 



This species, while figured and described by Stein under the title of Opalina 

 liivibrici, is identified by him with the form that previously received from Dujardin 

 the name of Leucophrys striata^ and should undoubtedly retain the prior specific desig- 

 nation. The Leucophrys nodulata of Dujardin does not agree with Miiller's type 

 bearing that name, but represents an altered condition only of the species now 

 under notice. Excepting for the absence of the horny armature this animalcule 

 corresponds in size and aspect with Hoplitophrya armata ; the habitat being likewise 

 identical, it is not improbable, as suggested by Stein, that it is an imperfectly 

 developed phase of that form. 



Anoplophrya branchiarum. Stein. 



Body shortly cylindrical, equally rounded at the two extremities, about 

 one and a half times as long as broad ; endoplast band-like, axial, extending 

 throughout the body ; contractile vesicles numerous, minute ; increasing by 

 transverse fission. Length 1-2 16." 



Hab. — Occurring as an endoparasite of the fresh-water shrimp, Gam- 

 marus pulex. 



This species, first described by Stein in the year 1852,1 occurs in swarms within 

 the branchial appendages of the Amphipodous Crustacean above named, its frequent 



* ' Sveriges Infusoriefauna,' 1867. 



t ' Zeitschrift fiir Wissenschaftliche Zoologie,' Bd. iii. 



